diff --git a/example/service/serverless.yml b/example/service/serverless.yml
index ea87fe8..028c48c 100644
--- a/example/service/serverless.yml
+++ b/example/service/serverless.yml
@@ -4,7 +4,7 @@ provider:
   name: aws
   profile: ${opt:profile, self:custom.profile}
   stage: ${opt:stage, self:custom.defaultStage}
-  runtime: nodejs16.x
+  runtime: nodejs20.x
   lambdaHashingVersion: '20201221'
 
 custom:
diff --git a/spec/helpers/services.js b/spec/helpers/services.js
index 8d8b690..2ab0a40 100644
--- a/spec/helpers/services.js
+++ b/spec/helpers/services.js
@@ -16,7 +16,7 @@ const defaultConfig = {
   service: 'aws-nodejs',
   provider: {
     name: 'aws',
-    runtime: 'nodejs12.x',
+    runtime: 'nodejs20.x',
     lambdaHashingVersion: '20201221',
     environment: {
       LAMBDA_STAGE:
diff --git a/src/index.js b/src/index.js
index 0b62f25..a56318d 100644
--- a/src/index.js
+++ b/src/index.js
@@ -198,10 +198,10 @@ class LocalstackPlugin {
 
     // Patch plugin methods
     function compileFunction(functionName) {
-      if (!this.shouldMountCode()) {
+      const functionObject = this.serverless.service.getFunction(functionName);
+      if (functionObject.image || !this.shouldMountCode()) {
         return compileFunction._functionOriginal.apply(null, arguments);
       }
-      const functionObject = this.serverless.service.getFunction(functionName);
       functionObject.package = functionObject.package || {};
       functionObject.package.artifact = __filename;
       return compileFunction._functionOriginal